阅读下面短文，从每小题所给的A、B、C、D四个选项中选出最佳选项。

C

    It's not just gloves that can help people keep warm in winter. Love can, too.

    A pair of 16-year-old American twins, Jack and Jake Moran, started a program called "Warm Hearts, Warm Hands" last month. Their aim was to collect new and used gloves with fellow students at Richards High School.

    "We started this program a few weeks ago after we saw something on the news about a student who got frostbite(冻伤的）riding his bike to school," Jack said. "I just kind of realized that there are so many kids who don't have or wear gloves. The school has started the collection competition among classes, and the class that collects the most gloves gets a pizza party.

    The twin brothers talked to other students about their program. Many teachers also joined in, bringing in gloves and encouraging their students to help meet the needs of local community members.

    "The conversations we are having now aren't so much about what actions we can take, but about ______▲_____ .This program has really shown me that I don't need to get on a plane and go to help refugees(难民）to make a difference. I can do it right here. I can do it every day." Jake said.

    More than 500 pairs of gloves have been collected in a month and more donations(捐赠品） are coming in every day, including hats and scarves.

双曲线 $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ $(a>0,b>0)$ 的渐近线为正方形OABC的边OA，OC所在的直线，点B为该双曲线的焦点。若正方形OABC的边长为2，则a=____.

用显微镜观察标本时，正确的操作顺序应是（　　）

①把装片放在载物台上，使标本位于低倍物镜的正下方　②眼睛从侧面注视物镜，转到粗准焦螺旋使镜筒下降至离标本0.5cm处　③转动转换器，使低倍物镜对准通光孔　④调节反光镜，左眼注视目镜，使视野明亮　⑤用左眼注视目镜，同时转动粗准焦螺旋使镜筒上升，直到看见物像；再用细准焦螺旋调节，使视野中的物像清晰　⑥转动转换器使高倍物镜对准通光孔　⑦转动细准焦螺旋，直到物像清晰　⑧将要观察的物像移到视野中央．

可以最大限度地发掘自我生命的潜力的是 (       )

中共“八大”为我国全面进行社会主义建设和党的建设指明了方向。“八大”作出正确决策的基础是（    ）